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    <title>Document</title>
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  <h1>演示：invalid 选择器</h1>  
  <input type="email" value="support">
  <p>多喜欢你</p>
  <div>
      <p>你知道吗</p>
      <p>生生</p>
  </div>
  <input placeholder="你好啊">
  <input value="hh" readonly>
  <input  value="加油" required>
</body>
</html>